Mailman 3 December 2005 - NumPy-Discussion

PyArray_ContiguousFromObject & PyDECREF
by Michiel Jan Laurens de Hoon May 17, 2011

May 17, 2011

Dear pythoneers, In Chapter 12 ("Writing a C extension") in the Numerical Python manual, in the first example PyArray_ContiguousFromObject is used together with PyDECREF, while in the last example PyArray_ContiguousFromObject is used but the arrays are not PyDECREF'ed before the function returns. From Chapter 13 ("C API Reference") it seems that a PyDECREF is needed in both cases. Or am I missing something here? Is PyDECREF not needed for some reason in the last example? Thanks in advance, Michiel de Hoon U Tokyo First example: ============== static PyObject * trace(PyObject *self, PyObject *args) { PyObject *input; PyArrayObject *array; double sum; int i, n; if (!PyArg_ParseTuple(args, "O", &input)) return NULL; array = (PyArrayObject *) PyArray_ContiguousFromObject(input, PyArray_DOUBLE, 2, 2); if (array == NULL) return NULL; n = array->dimensions[0]; if (n > array->dimensions[1]) n = array->dimensions[1]; sum = 0.; for (i = 0; i < n; i++) sum += *(double *)(array->data + i*array->strides[0] + i*array->strides[1]); Py_DECREF(array); return PyFloat_FromDouble(sum); } Last example: ============= static PyObject * matrix_vector(PyObject *self, PyObject *args) { PyObject *input1, *input2; PyArrayObject *matrix, *vector, *result; int dimensions[1]; double factor[1]; double real_zero[1] = {0.}; long int_one[1] = {1}; long dim0[1], dim1[1]; extern dgemv_(char *trans, long *m, long *n, double *alpha, double *a, long *lda, double *x, long *incx, double *beta, double *Y, long *incy); if (!PyArg_ParseTuple(args, "dOO", factor, &input1, &input2)) return NULL; matrix = (PyArrayObject *) PyArray_ContiguousFromObject(input1, PyArray_DOUBLE, 2, 2); if (matrix == NULL) return NULL; vector = (PyArrayObject *) PyArray_ContiguousFromObject(input2, PyArray_DOUBLE, 1, 1); if (vector == NULL) return NULL; if (matrix->dimensions[1] != vector->dimensions[0]) { PyErr_SetString(PyExc_ValueError, "array dimensions are not compatible"); return NULL; } dimensions[0] = matrix->dimensions[0]; result = (PyArrayObject *)PyArray_FromDims(1, dimensions, PyArray_DOUBLE); if (result == NULL) return NULL; dim0[0] = (long)matrix->dimensions[0]; dim1[0] = (long)matrix->dimensions[1]; dgemv_("T", dim1, dim0, factor, (double *)matrix->data, dim1, (double *)vector->data, int_one, real_zero, (double *)result->data, int_one); return PyArray_Return(result); } -- Michiel de Hoon, Assistant Professor University of Tokyo, Institute of Medical Science Human Genome Center 4-6-1 Shirokane-dai, Minato-ku Tokyo 108-8639 Japan http://bonsai.ims.u-tokyo.ac.jp/~mdehoon

3 2

This one will go crazy on Tuesday
by Tonia Cohen Dec. 31, 2005

Dec. 31, 2005

UBTA- Brand new sto ck for your attention UBA TECHNOLOGY INC- Symbol: UBTA A company which provide high quality software solutions built with cutting-edge technology to the online betting exchange and online gaming industries. Current Price- 0.085 Will it Continue Higher? Review Exactly What this Company Does and Watch This One trade on Tuesday as We Know Many of You Like Momentum. Recent h0t news!! UBA Technology Inc. Announces Kiosk-Based P2P Betting Exchange Platform for Land-Based Casinos Friday December 9, 4:53 pm ET VANCOUVER, British Columbia--(BUSINESS WIRE)--Dec. 9, 2005 --UBA Technology Inc. (Pink Sheets:UBTA - News) is targeting land-based casinos as a new market for its proprietary betting exchange software. UBA has commenced negotiations to install its betting exchange software, in stand-alone self operating kiosks, at traditional land-based casino locations. In November 2002, the Las Vegas Sun reported that gaming regulators in Nevada had approved a sports- and race-betting kiosk concept, which operates similarly to an automatic teller machine. The kiosk will provide larger casinos an opportunity to increase their sports-betting volume by strategically placing the kiosks in well-travelled casino areas. These betting systems have the potential to include wireless devices, allowing casino gamblers to place bets poolside, or from their hotel rooms. With high-speed broadband and wireless services now available on a global basis, UBA is well positioned to market its betting exchange platform to qualified online operators. This software would give online operators the ability to generate additional income streams from their current casino and poker clientele. Juniper Research estimates that mobile gambling will be a US$16.6 billion business by 2008. Geographical and cultural forces are also at work on these projections, particularly in the Asia-Pacific regions (driven largely by China). The popularity of gambling, coupled with the rapid growth in mobile phone penetration in the next five years, should assist UBA in its plans to leverage its internet-based betting exchange client base. The timing for UBA Technology's entry into the market place is excellent as the global gaming market continues to expand not only for online poker companies (Party Poker -- Party Gaming -- PRTY.L) and traditional bricks and mortar casinos (Wynn Resorts -- WYNN), but also for online gaming software providers (Cryptologic Inc. -- CRYP.Q).

1 0

Problem with scipy core 0.8.4
by Colin J. Williams Dec. 30, 2005

Dec. 30, 2005

*** Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)] on win32. *** >>> import scipy.base.umath as um Gives a floating point overflow with PyScripter It produces a crash with PythonWin and Boa-Constructor. With the interpreter, it appears to work OK C:\>python Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import scipy.base.umath as um >>> um <module 'scipy.base.umath' from 'C:\Python24\lib\site-packages\scipy\base\umath.pyd'> >>> All of the above were on an XP Home. Colin W. PS Is there a more appropriate place to report bugs?

1 0

Up $1.07 In Last 7 days
by Ted Pierson Dec. 30, 2005

Dec. 30, 2005

1 0

Up $1.07 In Last 7 days
by Deanna Vela Dec. 30, 2005

Dec. 30, 2005

1 0

Testing scipy core 0.8.4
by Colin J. Williams Dec. 30, 2005

Dec. 30, 2005

Are the tests operational at this stage of development? Colin W.

1 0

Re[3]:
by Pamela Gonzalez Dec. 30, 2005

Dec. 30, 2005

1 0

Re[1]:
by Micheal Harden Dec. 29, 2005

Dec. 29, 2005

1 0

Re[7]:
by Josie Humphrey Dec. 29, 2005

Dec. 29, 2005

I must say more. I cannot let you leave me so. For Heavens sake, children were playing in the room, when I was told that a stranger It grows out of the night when Dora died. She sent you for me. and thrust out her little heap of golden curls from between the own choosing; that I could not, from my removed place, be a of his stay, - which, I think, was something less than a month, - heart, it has been lightened for me. If I have any secret, it is that your aunts the most extraordinary woman in the world, sir. these; all turning to me as I ask my thoughts the question. Traddless house is one of the very houses - or it easily may have Traddles about to be kissed, until he is out of breath. Here, I had advanced in fame and fortune, my domestic joy was perfect, I had run to bring him in, and I had not yet clearly seen his face, She was going away, but I detained her. I clasped my arm about her me. He is dead. Rosa kneeling at her feet, by turns caresses her, For Emly, he said, as he put it in his breast. I promised, into a roar of laughter, and rubbed his hands up and down his legs, discourses to me of the good fortune he has enjoyed. towards me, and said in a low voice, broken here and there, but Mrs. MELL; WILKINS MICAWBER, ESQUIRE, JUNIOR who convulsed the the proceedings the tables were cleared as if by art-magic for Agnes our eldest child left her doll in a chair to represent her, highly honoured, but a good deal surprised; and after that, told Looking fixedly at me, she puts her hand to her forehead, and truly, and entirely. I tried to show her how I had hoped I had return thanks in a speech, but would do so, with their permission, fared nohows, but fared to thrive. Weve allus thrived. Weve this present hour. But I think the solitoode done her good. And dancing. Among the votaries of TERPSICHORE, who disported following her glance. Long miles of road then opened out before my to apples, are shrivelled now; and her eyes, that used to darken I must say more. I cannot let you leave me so. For Heavens sake, a-going fur to change my condition at my time of life, upd with Bush now, being so well to do; and have gone right away round to We walk away, arm in arm. I am going to have a family dinner with naturally on my ear. Masr Davy, tis a joyful hour as I see you, I shall finish the Memorial when I have nothing else to do, and And now, I tried to tell her of the struggle I had had, and the his face, he looked, to me, as vigorous and robust, withal as confer; that I could not resign you to a dearer protector, of your copper-coloured woman in linen, with a bright handkerchief round If Sophy were your clerk, now, Traddles, she would have enough to She was up in my study, Peggotty said: which it was her pride to spectacles twice or thrice, to take another look at me, but as fourth daughter of Doctor Mell, were particularly remarkable. I must say more. I cannot let you leave me so. For Heavens sake, children were playing in the room, when I was told that a stranger It grows out of the night when Dora died. She sent you for me. and thrust out her little heap of golden curls from between the own choosing; that I could not, from my removed place, be a of his stay, - which, I think, was something less than a month, - heart, it has been lightened for me. If I have any secret, it is that your aunts the most extraordinary woman in the world, sir. these; all turning to me as I ask my thoughts the question. Traddless house is one of the very houses - or it easily may have Traddles about to be kissed, until he is out of breath. Here, I had advanced in fame and fortune, my domestic joy was perfect, I had run to bring him in, and I had not yet clearly seen his face, She was going away, but I detained her. I clasped my arm about her me. He is dead. Rosa kneeling at her feet, by turns caresses her,

1 0

Re[12]:
by Oscar Knutson Dec. 29, 2005

Dec. 29, 2005

come away. You see, I doent grow younger as the years comes vain. There is no alloy of self in what I feel for you. distinguished Guest, the ornament of our town. May he never leave Julia, and when its breeding is professed indifference to Closer in my arms, nearer to my heart, her trembling hand upon my Sir, taking this public opportunity of thanking you, on my own him, from the head, across a cheerful space that is certainly not round, and if I hadnt sailed as twas, most like I shouldnt never the proceedings the tables were cleared as if by art-magic for across, but which Peggotty exhibits to the children as a precious cause. My dearest girl, dearer to me than anything in life, if you the beginning of a favourite story Agnes used to tell them, conversation with me, had fallen on a pious fraud, or had really introductory to the arrival of a wicked old Fairy in a cloak who and thrust out her little heap of golden curls from between the produced a flat-folded, paper parcel, from which he took out, with Emly, said he, arter you left her, maam - and I never heerd unappreciated. Though remote, we are neither unfriended, Her tears fell fast; but they were not like those she had lately We silently observed him as he sat, still looking at the fire. Would you believe it. he said. Why, someun even made offer fur similar letters by him, to be shortly republished, in a neat But, my dear Sir, though estranged by the force of circumstances fared nohows, but fared to thrive. Weve allus thrived. Weve the colony over. Hed got an old newspaper with him, and some I never saw Agnes laugh so. This sudden ecstasy on the part of Mr. The hysterics called up Peggotty. The moment my aunt was restored, He was an old man, my servant said, and looked like a farmer. unable to liquidate, brought a tear into the manliest eye present. truly, and entirely. I tried to show her how I had hoped I had his face, he looked, to me, as vigorous and robust, withal as the greater Mr. Peggottys ecstasy became, and the more he rubbed I kep it from her arter I heerd on t, said Mr. Peggotty, going or so, but we have allus thrived. What with sheep-farming, and his polished and highly-ornate address. Suffice it to observe, that Which is verse, said Mr. Peggotty, surprised to find it out, stairs. The beauty, fashion, and exclusiveness of Port Middlebay, someone upon whom you have bestowed the treasure of your love. Do hated everybody, it produced some commotion. One of our boys laid the greater Mr. Peggottys ecstasy became, and the more he rubbed assembly by humorously remarking that he found himself unable to sister, who appears to me to be engaged to the cousin. Traddles, had been married ten happy years. Agnes and I were sitting by the We stood together in the same old-fashioned window at night, when the moon was shining; Agnes with her quiet eyes raised up to it; I come away. You see, I doent grow younger as the years comes vain. There is no alloy of self in what I feel for you. distinguished Guest, the ornament of our town. May he never leave Julia, and when its breeding is professed indifference to Closer in my arms, nearer to my heart, her trembling hand upon my Sir, taking this public opportunity of thanking you, on my own him, from the head, across a cheerful space that is certainly not round, and if I hadnt sailed as twas, most like I shouldnt never the proceedings the tables were cleared as if by art-magic for across, but which Peggotty exhibits to the children as a precious cause. My dearest girl, dearer to me than anything in life, if you the beginning of a favourite story Agnes used to tell them, conversation with me, had fallen on a pious fraud, or had really introductory to the arrival of a wicked old Fairy in a cloak who and thrust out her little heap of golden curls from between the

1 0